Qt练习-白红宇的个人博客

Qt练习

发布日期：2021-06-29 11:58:01 浏览次数：2 分类：技术文章

本文共 49938 字，大约阅读时间需要 166 分钟。

测试按钮

mywidget.cpp

#include "mywidget.h"#include 
   
    #include 
    
     #include 
     
      MyWidget::MyWidget(QWidget *parent)    : QWidget(parent){    setMinimumSize(200,120);    setMaximumSize(200,120);//最小和最大一样说明这个窗口不能改变大小    QPushButton *quit = new QPushButton("Quit",this);    quit->setGeometry(40,40,75,30);    quit->setFont(QFont("Times",18,QFont::Bold));//字体使用times，18号字体，加粗    connect(quit,SIGNAL(clicked()),qApp,SLOT(quit()));//点击这个按钮，这个窗口消失}MyWidget::~MyWidget(){}

具有复选框的树形控件

widget.h

#ifndef WIDGET_H#define WIDGET_H#include 
   
    #include 
    
     namespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();    void init();    void updateParentItem(QTreeWidgetItem *item);private:    Ui::Widget *ui;public slots:    void treeItemChanged(QTreeWidgetItem *item,int column);};#endif // WIDGET_H

widget.cpp

#include "widget.h"#include "ui_widget.h"Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    init();    connect(ui->treeWidget,SIGNAL(itemChanged(QTreeWidgetItem*,int)),this,SLOT(treeItemChanged(QTreeWidgetItem*,int)));}Widget::~Widget(){    delete ui;}void Widget::init(){    ui->treeWidget->clear();    QTreeWidgetItem *group1 = new QTreeWidgetItem(ui->treeWidget);    group1->setText(0,"group1");    group1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);    group1->setCheckState(0,Qt::Unchecked);    QTreeWidgetItem *subItem1 = new QTreeWidgetItem(group1);    subItem1->setText(0,"subItem1");    subItem1->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);    subItem1->setCheckState(0,Qt::Unchecked);    QTreeWidgetItem *subItem2 = new QTreeWidgetItem(group1);    subItem2->setText(0,"subItem2");    subItem2->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);    subItem2->setCheckState(0,Qt::Unchecked);    QTreeWidgetItem *subItem3 = new QTreeWidgetItem(group1);    subItem3->setText(0,"subItem3");    subItem3->setFlags(Qt::ItemIsUserCheckable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);    subItem3->setCheckState(0,Qt::Unchecked);}void Widget::treeItemChanged(QTreeWidgetItem *item,int column){    QString itemText=item->text(0);    if(Qt::Checked == item->checkState(0))    {        QTreeWidgetItem *parent = item->parent();        int count = item->childCount();        if(count > 0)        {            for(int i=0; i
   
    child(i)->setCheckState(0,Qt::Checked);            }        }        else        {            updateParentItem(item);        }    }    else if(Qt::Unchecked == item->checkState(0))    {        int count = item->childCount();        if(count > 0)        {            for(int i=0; i
    
     child(i)->setCheckState(0,Qt::Unchecked);            }        }        else        {            updateParentItem(item);        }    }}void Widget::updateParentItem(QTreeWidgetItem *item){    QTreeWidgetItem *parent = item->parent();    if(parent == NULL)        return;    int selectedCount = 0;    int childcount = parent->childCount();    for(int i=0; i
     
      child(i);        if(childItem->checkState(0) == Qt::Checked)            selectedCount++;    }    if(selectedCount <= 0)//子列表每一个选中    {        parent->setCheckState(0,Qt::Unchecked);    }    else if(selectedCount > 0 && selectedCount < childcount)//子列表部分选中    {        parent->setCheckState(0,Qt::PartiallyChecked);    }    else//子列表都选中    {        parent->setCheckState(0,Qt::Checked);    }}

设置一个特定输入的文本框

dialog.h

#ifndef DIALOG_H#define DIALOG_H#include 
   
    namespace Ui {class Dialog;}class Dialog : public QDialog{    Q_OBJECTpublic:    explicit Dialog(QWidget *parent = 0);    ~Dialog();private:    Ui::Dialog *ui;private slots:    void on_lineEdit_textChanged();};#endif // DIALOG_H

dialog.cpp

#include "dialog.h"#include "ui_dialog.h"Dialog::Dialog(QWidget *parent) :    QDialog(parent),    ui(new Ui::Dialog){    ui->setupUi(this);    QRegExp regExp("[A-Za-z][1-9][0-9]{0,2}");    //这是一个正则表达式，输入的第一个为字母，接着为1-9的一个数字，再接着是0-2个0-9的数字    ui->lineEdit->setValidator(new QRegExpValidator(regExp,this));    //为输入框设置正则表达式    connect(ui->okButton,SIGNAL(clicked()),this,SLOT(accept()));    connect(ui->cancelButton,SIGNAL(clicked()),this,SLOT(reject()));}Dialog::~Dialog(){    delete ui;}void Dialog::on_lineEdit_textChanged(){    ui->okButton->setEnabled(ui->lineEdit->hasAcceptableInput());    //输入匹配时OK按钮才能用}

这里写图片描述

分隔窗口（各个窗口的大小可以随意拖拽）

main.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      int main(int argc, char *argv[]){    QApplication a(argc, argv);    QFont font("ZYSong18030",12);    a.setFont(font);    QSplitter *splitterMain = new QSplitter(Qt::Horizontal,0);    QTextEdit *textleft = new QTextEdit(QObject::tr("Left Widget"),splitterMain);    textleft->setAlignment(Qt::AlignCenter);    QSplitter *splitterRight = new QSplitter(Qt::Vertical,splitterMain);    splitterMain->setOpaqueResize(false);    QTextEdit *textUp = new QTextEdit(QObject::tr("Top Widget"),splitterRight);    textUp->setAlignment(Qt::AlignCenter);    QTextEdit *textBottom = new QTextEdit(QObject::tr("Bottom Widget"),splitterRight);    textBottom->setAlignment(Qt::AlignCenter);    splitterMain->setStretchFactor(1,1);    splitterMain->setWindowTitle(QObject::tr("splitter"));    splitterMain->show();    return a.exec();}

这里写图片描述

进度条和进度条对话框

progressdlg.h

#ifndef PROGRESSDLG_H#define PROGRESSDLG_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           class ProgressDlg : public QDialog{ Q_OBJECTpublic: ProgressDlg(QWidget *parent = 0); ~ProgressDlg();private slots: void startProgress();private: QLabel *fileNum; QLineEdit *fileNumLineEdit; QLabel *progressType; QComboBox *comboBox; QProgressBar *progressBar; QPushButton *startBtn; QGridLayout *mainLayout;};#endif // PROGRESSDLG_H

progressdlg.cpp

#include "progressdlg.h"#include 
   
    #include 
    
     #include 
     
      ProgressDlg::ProgressDlg(QWidget *parent)    : QDialog(parent){    QFont font("ZYSong18030",12);    setFont(font);    setWindowTitle(tr("Progress"));    fileNum = new QLabel;    fileNum->setText(tr("文件数目"));    fileNumLineEdit = new QLineEdit;    fileNumLineEdit->setText(tr("10000"));    progressType = new QLabel;    progressType->setText(tr("显示类型"));    comboBox = new QComboBox;    comboBox->addItem(tr("ProgressBar"));    comboBox->addItem(tr("ProgressDialog"));    progressBar = new QProgressBar;    startBtn = new QPushButton;    startBtn->setText(tr("开始"));    mainLayout = new QGridLayout(this);    mainLayout->addWidget(fileNum,0,0);    mainLayout->addWidget(fileNumLineEdit,0,1);    mainLayout->addWidget(progressType,1,0);    mainLayout->addWidget(comboBox,1,1);    mainLayout->addWidget(progressBar,2,0,1,2);    mainLayout->addWidget(startBtn,3,1);    mainLayout->setMargin(15);//设置布局管理器的外边距    mainLayout->setSpacing(10);//各个控件之间的距离    connect(startBtn,SIGNAL(clicked()),this,SLOT(startProgress()));}ProgressDlg::~ProgressDlg(){}void ProgressDlg::startProgress(){    bool ok;    int num = fileNumLineEdit->text().toInt(&ok);    if(comboBox->currentIndex() == 0)    {        progressBar->setRange(0,num);        for(int i=1; i<=num; i++)        {            progressBar->setValue(i);        }    }    else if(comboBox->currentIndex() == 1)    {        QProgressDialog *progress = new QProgressDialog(this);        QFont font("ZYSong18030",12);        progress->setFont(font);        progress->setWindowModality(Qt::WindowModal);        //时间至少为多少才出现对话框，没起作用啊        progress->setMinimumDuration(10000);        progress->setWindowTitle(tr("Please Wait"));        progress->setLabelText(tr("copying...."));        progress->setCancelButtonText(tr("取消"));        progress->setRange(0,num);        for(int i=1; i<=num; i++)        {            progress->setValue(i);            if(progress->wasCanceled())                return;        }    }}

这里写图片描述

电子时钟

digiclock.h

#ifndef DIGICLOCK_H#define DIGICLOCK_H#include 
   
    class DigiClock : public QLCDNumber{    Q_OBJECTpublic:    DigiClock(QWidget *parent = 0);    void mousePressEvent(QMouseEvent *);    void mouseMoveEvent(QMouseEvent *);    ~DigiClock();public slots:    void showTime();private:    QPoint dragPosition;//保存鼠标点相对于电子时钟窗体左上角的偏移值    bool showColon;//用于显示时间是否显示“:”};#endif // DIGICLOCK_H

digiclock.cpp

#include "digiclock.h"#include 
   
    #include 
    
     #include 
     
      DigiClock::DigiClock(QWidget *parent)    : QLCDNumber(parent){    QPalette p = palette();    p.setColor(QPalette::Window,Qt::blue);//给角色指定颜色    setPalette(p);//设置调色板    setWindowFlags(Qt::FramelessWindowHint);    setWindowOpacity(0.5);    QTimer *timer = new QTimer(this);    connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));    timer->start(1000);    showTime();    resize(150,60);//改变小部件的大小    showColon = true;//控制电子时钟“时”与“分”之间的表示秒钟的两个点的闪显功能}DigiClock::~DigiClock(){}void DigiClock::showTime(){    QTime time = QTime::currentTime();    QString text = time.toString("hh:mm");    if(showColon)    {        text[2]= ':';        showColon = false;    }    else    {        text[2] = ' ';        showColon = true;    }    display(text);}void DigiClock::mousePressEvent(QMouseEvent *event)//左键的作用没太理解{    if(event->button() == Qt::LeftButton)    {        dragPosition = event->globalPos() - frameGeometry().topLeft();        event->accept();//时间接收器接收这个事件    }    if(event->button() == Qt::RightButton)    {        close();//点击右键会关闭    }}void DigiClock::mouseMoveEvent(QMouseEvent *event)//左键的作用没太理解{    if(event->button() && Qt::LeftButton)    {        move(event->globalPos()-dragPosition);        event->accept();    }}

main.cpp

#include "clock.h"#include 
   
    #include 
    
     int main(int argc, char *argv[]){    QApplication a(argc, argv);    DigiClock clock;    clock.show();    return a.exec();}

这里写图片描述

QStackedLayout

可以用QComBox或者存有页面名字的QListWidget来让用户选择页面

mainwindow.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      MainWindow::MainWindow(QWidget *parent)    : QWidget(parent){   QWidget *firstPageWidget = new QWidget;   QWidget *secondPageWidget = new QWidget;   QWidget *thirdPageWidget = new QWidget;   QLabel *label1 = new QLabel(tr("one"),firstPageWidget);   QLabel *label2 = new QLabel(tr("two"),secondPageWidget);   QLabel *label3 = new QLabel(tr("three"),thirdPageWidget);   QStackedLayout *stackedLayout = new QStackedLayout;   stackedLayout->addWidget(firstPageWidget);   stackedLayout->addWidget(secondPageWidget);   stackedLayout->addWidget(thirdPageWidget);   QComboBox *pageComboBox = new QComboBox;   pageComboBox->addItem(tr("Page 1"));   pageComboBox->addItem(tr("Page 2"));   pageComboBox->addItem(tr("Page 3"));   connect(pageComboBox, SIGNAL(activated(int)),         stackedLayout, SLOT(setCurrentIndex(int)));   QVBoxLayout *mainLayout = new QVBoxLayout;   mainLayout->addLayout(stackedLayout);   mainLayout->addWidget(pageComboBox);   setLayout(mainLayout);}MainWindow::~MainWindow(){}

QDockWidget使用

dockwindows.cpp

#include "dockwindows.h"#include 
   
    #include 
    
     DockWindows::DockWindows(QWidget *parent)    : QMainWindow(parent){    setWindowTitle(tr("DockWindows"));    QTextEdit *te = new QTextEdit(this);    te->setText(tr("Main Window"));    te->setAlignment(Qt::AlignCenter);    setCentralWidget(te);//设置主窗口的中心控件    QDockWidget *dock = new QDockWidget(tr("DockWindow1"),this);    dock->setFeatures(QDockWidget::DockWidgetMovable);//可移动    dock->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);//设置可以停靠的位    QTextEdit *tel = new QTextEdit();    tel->setText(tr("can be moved between docks by the users"));    dock->setWidget(tel);    addDockWidget(Qt::RightDockWidgetArea,dock);//要放的位置，被放的控件    dock = new QDockWidget(tr("DockWindows2"),this);    dock->setFeatures(QDockWidget::DockWidgetClosable|QDockWidget::DockWidgetFloatable);//可关闭，可浮动    QTextEdit *te2 = new QTextEdit();    te2->setText(tr("可关闭，可浮动"));    dock->setWidget(te2);    addDockWidget(Qt::RightDockWidgetArea,dock);//要放的位置，被放的控件    dock = new QDockWidget(tr("DockWindows3"),this);    dock->setFeatures(QDockWidget::AllDockWidgetFeatures);    QTextEdit *te3 = new QTextEdit();    te3->setText(tr("所有特性"));    dock->setWidget(te3);//注意名字别设置错误，要是里面写成te,会把te当成窗口3的内容，而不是中心内容了    addDockWidget(Qt::RightDockWidgetArea,dock);}DockWindows::~DockWindows(){}

这里写图片描述

带标签的QDockWidget

qdockwidget3.cpp

#include "qdockwidget3.h"#include 
   
    QDockWidget3::QDockWidget3(QWidget *parent)    : QMainWindow(parent){    QDockWidget *s1 = new QDockWidget(tr("页面1"),this);    s1->setFeatures(QDockWidget::AllDockWidgetFeatures);    s1->setAllowedAreas(Qt::LeftDockWidgetArea);    addDockWidget(Qt::LeftDockWidgetArea,s1);    QDockWidget *s2 = new QDockWidget(tr("页面2"),this);    s2->setFeatures(QDockWidget::AllDockWidgetFeatures);    s2->setAllowedAreas(Qt::LeftDockWidgetArea);    addDockWidget(Qt::LeftDockWidgetArea,s2);    this->tabifyDockWidget(s1,s2);//s1加到s2后面形成标签    QDockWidget *s3 = new QDockWidget(tr("页面3"),this);    s3->setFeatures(QDockWidget::AllDockWidgetFeatures);    s3->setAllowedAreas(Qt::LeftDockWidgetArea);    addDockWidget(Qt::LeftDockWidgetArea,s3);    this->tabifyDockWidget(s1,s3);//s1加到s3后面形成标签}QDockWidget3::~QDockWidget3(){}

这里写图片描述

参考资料：

可扩展对话框练习

extensiondlg.h

#ifndef EXTENSIONDLG_H#define EXTENSIONDLG_H#include 
   
    #include 
    
     class ExtensionDlg : public QDialog{    Q_OBJECTpublic:    ExtensionDlg(QWidget *parent = 0);    ~ExtensionDlg();private slots:    void showDetailInfo();private:    void createBaseInfo();    void createDetailInfo();    QWidget *baseWidget;    QWidget *detailWidget;};#endif // EXTENSIONDLG_H

extensiondlg.cpp

#include "extensiondlg.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          ExtensionDlg::ExtensionDlg(QWidget *parent) : QDialog(parent){ setWindowTitle(tr("Extension Dialog")); createBaseInfo(); createDetailInfo(); QVBoxLayout *layout = new QVBoxLayout(this); layout->addWidget(baseWidget); layout->addWidget(detailWidget); layout->setSizeConstraint(QLayout::SetFixedSize);//设置窗体大小固定，否则再次点击“详细”按钮时，对话框不能恢复到初始状态 layout->setSpacing(10);//设置布局内的间距}ExtensionDlg::~ExtensionDlg(){}void ExtensionDlg::createBaseInfo(){ baseWidget = new QWidget; QLabel *nameLabel = new QLabel(tr("姓名")); QLineEdit *nameLineEdit = new QLineEdit; QLabel *sexLabel = new QLabel(tr("性别")); QComboBox *sexComboBox = new QComboBox; sexComboBox->insertItem(0,tr("女")); sexComboBox->insertItem(1,tr("男")); QGridLayout *leftLayout = new QGridLayout; leftLayout->addWidget(nameLabel,0,0); leftLayout->addWidget(nameLineEdit,0,1); leftLayout->addWidget(sexLabel,1,0); leftLayout->addWidget(sexComboBox,1,1); QPushButton *OKBtn = new QPushButton(tr("确定")); QPushButton *DetailBtn = new QPushButton(tr("详细")); QDialogButtonBox *btnBox = new QDialogButtonBox(Qt::Vertical); btnBox->addButton(OKBtn,QDialogButtonBox::ActionRole); btnBox->addButton(DetailBtn,QDialogButtonBox::ActionRole); QHBoxLayout *mainLayout = new QHBoxLayout(baseWidget); mainLayout->addLayout(leftLayout); mainLayout->addWidget(btnBox); connect(DetailBtn,SIGNAL(clicked()),this,SLOT(showDetailInfo()));}void ExtensionDlg::createDetailInfo(){ detailWidget = new QWidget; QLabel *ageLabel = new QLabel(tr("年龄")); QLineEdit *ageLineEdit = new QLineEdit; ageLineEdit->setText(tr("30")); QLabel *depLabel = new QLabel; depLabel->setText(tr("部门")); QComboBox *depCom = new QComboBox; depCom->addItem(tr("部门1")); depCom->addItem(tr("部门2")); depCom->addItem(tr("部门3")); depCom->addItem(tr("部门4")); QLabel *emailLabel = new QLabel(tr("email")); QLineEdit *emailLineEdit = new QLineEdit; QGridLayout *mainLayout = new QGridLayout(detailWidget); mainLayout->addWidget(ageLabel,0,0); mainLayout->addWidget(ageLineEdit,0,1); mainLayout->addWidget(depLabel,1,0); mainLayout->addWidget(depCom,1,1); mainLayout->addWidget(emailLabel,2,0); mainLayout->addWidget(emailLineEdit,2,1); detailWidget->hide();}void ExtensionDlg::showDetailInfo(){ if(detailWidget->isHidden()) detailWidget->show(); else detailWidget->hide();}

这里写图片描述

读取文件

qt控制台应用

main.cpp

#include 
   
    #include 
    
     #include 
     
      int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QFile file("textFile1.txt");//将文件放到编译产生的目录下，也可以指定路径    if(file.open(QIODevice::ReadOnly))    {        char buffer[2048];        qint64 lineLen = file.readLine(buffer,sizeof(buffer));//返回读到的字节数        if(lineLen != -1)//如果东西没有读到，则返回-1        {            qDebug()<

QTextStream类读写文件

#include 
   
    #include 
    
     #include 
     
      int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QFile data("123.txt");    if(data.open(QFile::WriteOnly|QFile::Truncate))    {        QTextStream ff(&data);//将数据写入data指向的文件中,参数为文件指针        ff<
      
       <
       
        <
        
         <<90<

这里写图片描述

读写二进制文件

mainwindow.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    fileFun();}MainWindow::~MainWindow(){}void MainWindow::fileFun(){    QFile file("binary.dat");    file.open(QIODevice::WriteOnly|QIODevice::Truncate);    QDataStream out(&file);    out<
       
        >name>>birthday>>age;    qDebug()<
        
         <
         
          <

main.cpp

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        //递归读取分目录的大小qint64 du(const QString &path){    QDir dir(path);    qint64 size = 0;    //QDir::Files,List files.    foreach (QFileInfo fileinfo, dir.entryInfoList(QDir::Files)) {        size += fileinfo.size();    }    //QDir::Dirs,List directories that match the filters.    //QDir::NoDotAndDotDot,Do not list the special entries "." and "..".    foreach (QString subDir, dir.entryList(QDir::Dirs|QDir::NoDotAndDotDot)) {        size += du(path + QDir::separator() + subDir);    }    char unit = 'B';    qint64 curSize = size;    if(curSize > 1024)    {        curSize /= 1024;        unit = 'K';        if(curSize > 1024)        {            curSize /= 1024;            unit = 'M';            if(curSize > 1024)            {                curSize /= 1024;                unit = 'G';            }        }    }    //返回目录的名字及大小    qDebug()<
        
         <
         
          <<"\t"<
          
           <
           
             1) { path = args[1]; } else { path = QDir::currentPath(); } qDebug()<
            
             <

这里写图片描述

文件显示器

fileview.h

#ifndef FILEVIEW_H#define FILEVIEW_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          class FileView : public QDialog{ Q_OBJECTpublic: FileView(QWidget *parent = 0); ~FileView(); void showFileInfoList(QFileInfoList list);public slots: void slotShow(QDir dir); void slotDirshow(QListWidgetItem *item);private: QLineEdit *fileLineEdit; QListWidget *fileListWidget; QVBoxLayout *mainLayout;};#endif // FILEVIEW_H

fileview.cpp

#include "fileview.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         FileView::FileView(QWidget *parent) : QDialog(parent){ setWindowTitle(tr("File View")); fileLineEdit = new QLineEdit(tr("/")); fileListWidget = new QListWidget; mainLayout = new QVBoxLayout(this); mainLayout->addWidget(fileLineEdit); mainLayout->addWidget(fileListWidget); //returnPressed,信号返回或者回车键被按下时触发 connect(fileLineEdit,SIGNAL(returnPressed()),this,SLOT(slotShow(QDir))); //这一个槽函数没有连接上，有时间改不会了 connect(fileListWidget,SIGNAL(itemDoubleClicked(QListWidgetItem*)),this,SLOT(slotDirshow(QListWidgetItem*))); QString root = "/"; QDir rootDir(root); QStringList string; string << "*"; QFileInfoList list = rootDir.entryInfoList(string); showFileInfoList(list);}FileView::~FileView(){}//显示文本款指定的目录下的文件void FileView::slotShow(QDir dir){ QStringList string; string << "*"; QFileInfoList list = dir.entryInfoList(string,QDir::AllEntries,QDir::DirsFirst); //列出所有目录和文件，目录放前面，文件放后面 showFileInfoList(list);}//双击浏览器中显示的目录进入下一级目录，单击".."返回上一级目录，编辑框显示当前所在目录void FileView::showFileInfoList(QFileInfoList list){ fileListWidget->clear();//清空列表控件 for(unsigned int i=0; i
         
          addItem(tmp); } else { QIcon icon("file.png"); QString filename = temp.fileName(); QListWidgetItem *tmp = new QListWidgetItem(icon,filename); fileListWidget->addItem(tmp); } }}void FileView::slotDirshow(QListWidgetItem *item){ QString str = item->text(); QDir dir; dir.setPath(fileLineEdit->text()); dir.cd(str); fileLineEdit->setText(dir.absolutePath()); slotShow(dir);}

这里写图片描述

获取文件信息

fileinfo.h

#ifndef FILEINFO_H#define FILEINFO_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        class FileInfo : public QDialog{    Q_OBJECTpublic:    FileInfo(QWidget *parent = 0);    ~FileInfo();private slots:    void slotFile();    void slotGet();private:    QLabel *fileNameLabel;    QLineEdit *fileNameLineEdit;    QPushButton *fileNameBtn;    QLabel *sizeLabel;    QLineEdit *sizeLineEdit;    QLabel *createTimeLabel;    QLineEdit *createTimeLineEdit;    QLabel *lastModifyLabel;    QLineEdit *lastModifyEdit;    QLabel *lastReadLabel;    QLineEdit *lastReadLineEdit;    QLabel *propertyLabel;    QCheckBox *isDir;    QCheckBox *isFile;    QCheckBox *link;    QCheckBox *isHidden;    QCheckBox *isReadable;    QCheckBox *isWritable;    QCheckBox *isExecutable;    QPushButton *getBtn;};#endif // FILEINFO_H

fileinfo.cpp

#include "fileinfo.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        FileInfo::FileInfo(QWidget *parent)    : QDialog(parent){    fileNameLabel = new QLabel(tr("文件名"));    fileNameLineEdit = new QLineEdit;    fileNameBtn = new QPushButton(tr("文件"));    sizeLabel = new QLabel(tr("大小"));    sizeLineEdit = new QLineEdit;    createTimeLabel = new QLabel(tr("创建时间"));    createTimeLineEdit = new QLineEdit;    lastModifyLabel = new QLabel(tr("最后修改时间"));    lastModifyEdit = new QLineEdit;    lastReadLabel = new QLabel(tr("最后访问时间"));    lastReadLineEdit = new QLineEdit;    propertyLabel = new QLabel(tr("属性"));    isDir = new QCheckBox(tr("目录"));    isFile = new QCheckBox(tr("文件"));    link = new QCheckBox(tr("符号连接"));    isHidden = new QCheckBox(tr("隐藏"));    isReadable = new QCheckBox(tr("读"));    isWritable = new QCheckBox(tr("写"));    isExecutable = new QCheckBox(tr("执行"));    getBtn = new QPushButton(tr("获得文件信息"));    QGridLayout *gridLayout = new QGridLayout;    gridLayout->addWidget(fileNameLabel,0,0);    gridLayout->addWidget(fileNameLineEdit,0,1);    gridLayout->addWidget(fileNameBtn,0,2);    gridLayout->addWidget(sizeLabel,1,0);    gridLayout->addWidget(sizeLineEdit,1,1,1,2);    gridLayout->addWidget(createTimeLabel,2,0);    gridLayout->addWidget(createTimeLineEdit,2,1,1,2);    gridLayout->addWidget(lastModifyLabel,3,0);    gridLayout->addWidget(lastModifyEdit,3,1,1,2);    gridLayout->addWidget(lastReadLabel,4,0);    gridLayout->addWidget(lastReadLineEdit,4,1,1,2);    QHBoxLayout *layout2 = new QHBoxLayout;    layout2->addWidget(propertyLabel);    layout2->addStretch();    QHBoxLayout *layout3 = new QHBoxLayout;    layout3->addWidget(isDir);    layout3->addWidget(isFile);    layout3->addWidget(link);    layout3->addWidget(isHidden);    layout3->addWidget(isReadable);    layout3->addWidget(isWritable);    layout3->addWidget(isExecutable);    QHBoxLayout *layout4 = new QHBoxLayout;    layout4->addWidget(getBtn);    QVBoxLayout *mainLayout = new QVBoxLayout(this);    mainLayout->addLayout(gridLayout);    mainLayout->addLayout(layout2);    mainLayout->addLayout(layout3);    mainLayout->addLayout(layout4);    connect(fileNameBtn,SIGNAL(clicked()),this,SLOT(slotFile()));    connect(getBtn,SIGNAL(clicked()),this,SLOT(slotGet()));}FileInfo::~FileInfo(){}void FileInfo::slotFile(){    QString fileName = QFileDialog::getOpenFileName(this,"打开","/","files(*)");    fileNameLineEdit->setText(fileName);}void FileInfo::slotGet(){    QString file = fileNameLineEdit->text();    QFileInfo info(file);    qint64 size = info.size();    QDateTime created = info.created();    QDateTime lastModify = info.lastModified();    QDateTime lastRead = info.lastRead();    bool isDir1 = info.isDir();    bool isFile1 = info.isFile();    bool isSymLink1 = info.isSymLink();    bool isHidden1 = info.isHidden();    bool isReadable1 = info.isReadable();    bool isWritable1 = info.isWritable();    bool isExecutable1 = info.isExecutable();    sizeLineEdit->setText(QString::number(size));    createTimeLineEdit->setText(created.toString());    lastModifyEdit->setText(lastModify.toString());    lastReadLineEdit->setText(lastRead.toString());    //剩下的选中状态不写了，太麻烦    isDir->setCheckState(isDir ? Qt::Checked : Qt::Unchecked);}

主窗体练习

ShowWidget是中心部件

showwidge.h

#ifndef SHOWWIDGET_H#define SHOWWIDGET_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        class ShowWidget : public QWidget{
       Q_OBJECTpublic:    explicit ShowWidget(QWidget *parent = 0);    QImage img;    QLabel *imageLabel;//用来显示图形的标签    QTextEdit *text;    ~ShowWidget();signals:public slots:};#endif // SHOWWIDGET_H

showwidget.cpp

#include "showwidget.h"#include 
   
    ShowWidget::ShowWidget(QWidget *parent) : QWidget(parent){    imageLabel = new QLabel;    imageLabel->setScaledContents(true);    text = new QTextEdit;    QHBoxLayout *mainLayout = new QHBoxLayout(this);    mainLayout->addWidget(imageLabel);    mainLayout->addWidget(text);}ShowWidget::~ShowWidget(){}

ImgProcessor是主窗口

imgprocessor.h

#ifndef IMGPROCESSOR_H#define IMGPROCESSOR_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         class ImgProcessor : public QMainWindow{ Q_OBJECTpublic: ImgProcessor(QWidget *parent = 0); ~ImgProcessor(); void createActions(); void createMenus(); void createToolBars(); void loadFile(QString filename); void mergeFormat(QTextCharFormat);private: QMenu *fileMenu; QMenu *zoomMenu;//变焦 QImage img; QString fileName; ShowWidget *showWidget; QAction *openFileAction; QAction *newFileAction; QAction *printTextAction; QAction *printImageAction; QAction *exitAction; QAction *aboutAction; QAction *copyAction; QAction *cutAction; QAction *pasteAction; QAction *undoAction; QAction *redoAction; QToolBar *fileTool; QToolBar *doToolBar;protected slots: void showNewFile(); void showOpenFile(); void showAbout();};#endif // IMGPROCESSOR_H

imgprocessor.cpp

#include "imgprocessor.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       ImgProcessor::ImgProcessor(QWidget *parent)    : QMainWindow(parent){    setWindowTitle(tr("Easy Word"));    showWidget = new ShowWidget(this);    setCentralWidget(showWidget);//设定中心部件    createActions();    createMenus();    createToolBars();    if(img.load("E:\\QTworkspace\\ImgProcessor\\image.png"))//如果图片加载成功    {        showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));    }}ImgProcessor::~ImgProcessor(){}void ImgProcessor::createActions(){    openFileAction = new QAction(tr("打开"),this);    openFileAction->setShortcut(tr("Ctrl+O"));    openFileAction->setStatusTip(tr("打开一个文件"));//悬浮在上面的时候的指示    connect(openFileAction,SIGNAL(triggered()),this,SLOT(showOpenFile()));    newFileAction = new QAction(tr("新建"),this);    newFileAction->setStatusTip(tr("新建一个文件"));    connect(newFileAction,SIGNAL(triggered()),this,SLOT(showNewFile()));    aboutAction = new QAction(tr("关于"),this);    connect(aboutAction,SIGNAL(triggered()),this,SLOT(showAbout()));    exitAction = new QAction(tr("退出"),this);    exitAction->setStatusTip(tr("退出程序"));    connect(exitAction,SIGNAL(triggered()),this,SLOT(close()));    copyAction =new QAction(tr("复制"),this);    connect(copyAction,SIGNAL(triggered()),showWidget->text,SLOT(copy()));    cutAction = new QAction(tr("剪切"),this);    connect(cutAction,SIGNAL(triggered()),showWidget->text,SLOT(cut()));    pasteAction = new QAction(tr("粘贴"),this);    connect(pasteAction,SIGNAL(triggered()),showWidget->text,SLOT(paste()));    undoAction = new QAction("撤销",this);    connect(undoAction,SIGNAL(triggered()),showWidget->text,SLOT(undo()));    redoAction = new QAction("恢复",this);    connect(redoAction,SIGNAL(triggered()),showWidget->text,SLOT(redo()));}void ImgProcessor::createMenus(){    fileMenu = menuBar()->addMenu(tr("文件"));//返回QMainWindow的QMenuBar,并用QMenuBar的函数添加菜单    fileMenu->addAction(openFileAction);    fileMenu->addAction(newFileAction);    fileMenu->addSeparator();//在下拉的条中加入一个分隔符    fileMenu->addAction(aboutAction);    fileMenu->addAction(exitAction);    zoomMenu = menuBar()->addMenu(tr("编辑"));    zoomMenu->addAction(copyAction);    zoomMenu->addAction(cutAction);    zoomMenu->addAction(pasteAction);}void ImgProcessor::createToolBars(){    fileTool = addToolBar("File");//添加到QMainWindow中的ToolBar    fileTool->addAction(openFileAction);    fileTool->addAction(newFileAction);    doToolBar = addToolBar("doEdit");    doToolBar->addAction(undoAction);    doToolBar->addAction(redoAction);}void ImgProcessor::showNewFile(){    ImgProcessor *newImgProcessor = new ImgProcessor;    newImgProcessor->show();}void ImgProcessor::showOpenFile(){    fileName = QFileDialog::getOpenFileName(this);    if(!fileName.isEmpty())    {        if(showWidget->text->document()->isEmpty())//文本内容为空就重新兴建一个        {            loadFile(fileName);        }        else        {            ImgProcessor *newImgProcessor = new ImgProcessor;            newImgProcessor->show();            newImgProcessor->loadFile(fileName);        }    }}void ImgProcessor::loadFile(QString filename){    QFile file(filename);    if(file.open(QIODevice::ReadOnly|QIODevice::Text))    {        QTextStream textStream(&file);        while(!textStream.atEnd())        {            showWidget->text->append(textStream.readLine());            //读取一行文本，里面的参数是每次读取的最大长度        }    }}void ImgProcessor::showAbout(){    QMessageBox::about(this,tr("关于产品"),tr("create by zzti_erlie"));}

这里写图片描述

QTableWidget

表格类一般用到3个类，一个是QTableView可以定义的部分很多，一个是QTableWidget,一个是QTableWidgetItem（表格里面插入的内容），注意：要设置QTableWidget的行数和列数添加的Item才会显示出来

参考博客1：

参考博客2：

参考博客3：

mainwindow.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    //指定行和列    QTableWidget *table = new QTableWidget(5,3,this);    //table->resize(600,600);    QStringList header;    header << "书名" << "出版社" << "作者";    //设置列标题    table->setHorizontalHeaderLabels(header);    //从QTableView上继承下来的方法,返回的是QHeaderView,并且设置最后一列自动填充剩余空间    table->horizontalHeader()->setStretchLastSection(true);    //table如何你设置了5列，它会自动加上一列，显示行号，这个就是设置不要系统自动加的那一列    table->verticalHeader()->setVisible(false);    //从QAbstractItemView继承下来的方法,项目的修改方式    table->setEditTriggers(QAbstractItemView::DoubleClicked);    //从QAbstractItemView继承下来的方法,选中的方式    table->setSelectionBehavior(QAbstractItemView::SelectRows);    QTableWidgetItem *item[10];    QString bookName[5] = {"书名1","书名2","书名3","书名4","书名5"};    for(int i=0; i<5; i++)    {        item[i] = new QTableWidgetItem;        item[i]->setText(bookName[i]);        //3个参数分别是行号，列号，和要放的元素        table->setItem(i,0,item[i]);    }    setCentralWidget(table);}

这里写图片描述

QTabWidget

mainwindow.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    QTabWidget *tabWidget = new QTabWidget;    QWidget *mainWidget = new QWidget;    QWidget *firstWidget = new QWidget;    QWidget *secondWidget = new QWidget;    QWidget *thirdWidget = new QWidget;    tabWidget->addTab(firstWidget,tr("第一页"));    tabWidget->addTab(secondWidget,tr("第二页"));    tabWidget->addTab(thirdWidget,tr("第三页"));    QHBoxLayout *mainLayout = new QHBoxLayout;    mainLayout->addWidget(tabWidget);    mainWidget->setLayout(mainLayout);    setCentralWidget(mainWidget);}

这里写图片描述

QTreeWidget

mainwindow.cpp

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    QTreeWidget *treeWidget = new QTreeWidget();    QStringList headers;    headers << "Name"            << "Numbers";    treeWidget->setHeaderLabels(headers);    QTreeWidgetItem *root = new QTreeWidgetItem(treeWidget);    root->setText(0,"root");    root->setText(1,"0");    //直接指定父对象    QTreeWidgetItem *leaf1 = new QTreeWidgetItem(root);    leaf1->setText(0,"leaf1");    leaf1->setText(1,"1");    //先不指定父对象，以后被添加    QTreeWidgetItem *leaf2 = new QTreeWidgetItem();    leaf2->setText(0,"leaf2");    leaf2->setText(1,"2");    root->addChild(leaf2);    QList
       
         items;    for(int i=0; i<10; i++)        items.append(new QTreeWidgetItem((QTreeWidget*)0,QStringList(QString("ListItem%1").arg(i))));    treeWidget->insertTopLevelItems(1,items);    setCentralWidget(treeWidget);}

这里写图片描述

QListWidget

#include "mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    QListWidget *listWidget = new QListWidget(this);    //直接指定父对象    new QListWidgetItem(tr("item1"),listWidget);    new QListWidgetItem(tr("item2"),listWidget);    //直接添加，不用指定父对象    listWidget->addItem(new QListWidgetItem(tr("item4")));    //在指定行插入    listWidget->insertItem(2,new QListWidgetItem(tr("item3")));    setCentralWidget(listWidget);}

这里写图片描述

QListWidget实现文件组的选择

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include 
   
    #include 
    
     MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);}MainWindow::~MainWindow(){    delete ui;}//打开文件按钮void MainWindow::on_openFileBtn_clicked(){    QStringList files = QFileDialog::getOpenFileNames(                            this,                            "Select one or more files to open",                            "",                            "Xml File (*.xml)");    foreach (QString fileUrl, files) {        int index = fileUrl.lastIndexOf("/");        //从url中截取文件名字        QString fileName = fileUrl.mid(index+1);        ui->listWidget->addItem(fileName);        //存储文件名字和文件url的map,方面以后操作，例子懒的写了        map.insert(fileName,fileUrl);    }}//确定按钮void MainWindow::on_okBtn_clicked(){}//把选中的条目移动到右边void MainWindow::on_addBtn_clicked(){    QListWidgetItem *listWidgetItem = ui->listWidget->currentItem();    //没有选中按钮就点击会发生错误    if (listWidgetItem != NULL) {        qDebug() << listWidgetItem->text();        QListWidgetItem *listWidgetItem1 = new QListWidgetItem(listWidgetItem->text());        ui->listWidget_2->addItem(listWidgetItem1);        ui->listWidget->removeItemWidget(listWidgetItem);        delete listWidgetItem;    }}//把选中的条目移动到左边void MainWindow::on_removeBtn_clicked(){    QList
     
       list = ui->listWidget_2->selectedItems();    foreach (QListWidgetItem* listWidgetItem, list) {        QListWidgetItem *listWidget1 = new QListWidgetItem(listWidgetItem->text());        ui->listWidget->addItem(listWidget1);        ui->listWidget_2->removeItemWidget(listWidgetItem);        delete listWidgetItem;    }}//把选中的条目向上移动void MainWindow::on_moveUpBtn_clicked(){    qDebug() << "moveup";    QListWidgetItem *item = ui->listWidget_2->currentItem();    if (item != NULL) {        QListWidgetItem *item1 = new QListWidgetItem(item->text());        int index = ui->listWidget_2->currentRow();        if (index >= 1) {            ui->listWidget_2->insertItem(index-1,item1);            ui->listWidget_2->removeItemWidget(item);            delete item;        }    }}//把选中的条目向下移动void MainWindow::on_moveDownBtn_clicked(){    qDebug() << "movedown";    QListWidgetItem *item = ui->listWidget_2->currentItem();    if (item != NULL) {        QListWidgetItem *item1 = new QListWidgetItem(item->text());        int index = ui->listWidget_2->currentRow();        qDebug() << ui->listWidget_2->count();        qDebug() << index;        if (index < ui->listWidget_2->count()-1) {            ui->listWidget_2->insertItem(index+2,item1);            ui->listWidget_2->removeItemWidget(item);            delete item;        }    }}

这里写图片描述

从XML中解析出来的数据显示在QTableWidget中

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include 
   
    namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();    void doXML(const QString operate);private slots:    void on_queryBtn_clicked();    void on_deleteBtn_clicked();    void on_updateBtn_clicked();    void on_insertBtn_clicked();    void on_loadBtn_clicked();private:    Ui::MainWindow *ui;};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){ ui->setupUi(this); setWindowTitle(tr("小型图书管理系统")); ui->tableWidget->setColumnCount(3); QStringList header; header << "编号" << "书名" << "作者"; ui->tableWidget->setHorizontalHeaderLabels(header); //添加XML说明 QDomDocument doc; QDomProcessingInstruction instruction = doc.createProcessingInstruction("xml","version=\"1.0\" encoding=\"UTF-8\""); doc.appendChild(instruction); //添加根元素 QDomElement root = doc.createElement("书库"); doc.appendChild(root); //添加第一个图书元素 QDomElement book = doc.createElement("图书"); QDomAttr id = doc.createAttribute("编号"); id.setValue("1"); book.setAttributeNode(id); QDomElement title = doc.createElement("书名"); QDomText text; text = doc.createTextNode("Qt"); title.appendChild(text); QDomElement author = doc.createElement("作者"); text = doc.createTextNode("li"); author.appendChild(text); book.appendChild(title); book.appendChild(author); root.appendChild(book); QFile file("my.xml"); //以只读和重写方式打开 if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) return; QTextStream out(&file); doc.save(out,4); file.close();}MainWindow::~MainWindow(){ delete ui;}void MainWindow::doXML(const QString operate){ //如果操作中途有失败，则这个会显示出来，如果操作都成功则这个显示会被覆盖 statusBar()->showMessage("操作失败",2000); QFile file("my.xml"); if(!file.open(QIODevice::ReadOnly)) return; QDomDocument doc; if(!doc.setContent(&file)) { file.close(); return; } file.close(); QDomNodeList list = doc.elementsByTagName("图书"); for(int i=0; i
             
              lineEdit->text()) { if(operate == "delete") { QDomElement root = doc.documentElement(); root.removeChild(list.at(i)); file.setFileName("my.xml"); if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) return; QTextStream out(&file); doc.save(out,4); file.close(); statusBar()->showMessage("删除成功",2000); } else if(operate == "update") { QDomNodeList child = list.at(i).childNodes(); //将子节点的第一个节点即文本节点的内容改变 child.at(0).toElement().firstChild().setNodeValue(ui->lineEdit_2->text()); child.at(1).toElement().firstChild().setNodeValue(ui->lineEdit_3->text()); file.setFileName("my.xml"); if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) return; QTextStream out(&file); doc.save(out,4); file.close(); statusBar()->showMessage("更改成功",2000); } else if(operate == "query") { ui->tableWidget->clear(); //清除的时候会把标题也清除，所以重新写一下标题 QStringList header; header << "编号" << "书名" << "作者"; ui->tableWidget->setHorizontalHeaderLabels(header); ui->tableWidget->setRowCount(1); QTableWidgetItem *item = new QTableWidgetItem; item->setText(e.attribute("编号")); ui->tableWidget->setItem(0,0,item); QDomNodeList list = e.childNodes(); for(int i=0; i
              
               setText(node.toElement().text()); ui->tableWidget->setItem(0,1,item); } else if(node.toElement().tagName() == "作者") { item->setText(node.toElement().text()); ui->tableWidget->setItem(0,2,item); } } } statusBar()->showMessage("查询成功",2000); } } }}void MainWindow::on_queryBtn_clicked(){ doXML("query");}void MainWindow::on_deleteBtn_clicked(){ doXML("delete");}void MainWindow::on_updateBtn_clicked(){ doXML("update");}void MainWindow::on_insertBtn_clicked(){ QFile file("my.xml"); if(!file.open(QIODevice::ReadOnly)) return; QDomDocument doc; if(!doc.setContent(&file)) { file.close(); return; } file.close(); QDomElement root = doc.documentElement(); QDomElement book = doc.createElement("图书"); QDomAttr id = doc.createAttribute("编号"); QDomElement title = doc.createElement("书名"); QDomElement author = doc.createElement("作者"); QDomText text; QString lastNum = root.lastChild().toElement().attribute("编号"); int count = lastNum.toInt() + 1; id.setValue(QString::number(count)); book.setAttributeNode(id); text = doc.createTextNode(ui->lineEdit_2->text()); title.appendChild(text); text = doc.createTextNode(ui->lineEdit_3->text()); author.appendChild(text); book.appendChild(title); book.appendChild(author); root.appendChild(book); if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) return; QTextStream out(&file); doc.save(out,4); file.close();}void MainWindow::on_loadBtn_clicked(){ QFile file("my.xml"); if(!file.open(QIODevice::ReadOnly)) return; QDomDocument doc; if(!doc.setContent(&file)) { file.close(); return; } file.close(); //返回根元素 QDomElement root = doc.documentElement(); //返回第一个节点 QDomNode n = root.firstChild(); //记录是表格的第几行 int row = -1; //table如何你设置了5列，它会自动加上一列，显示行号，这个就是设置不要系统自动加的那一列 ui->tableWidget->verticalHeader()->setVisible(false); while(!n.isNull()) { if(n.isElement()) { row++; //设置表格的行数不然不会显示 ui->tableWidget->setRowCount(row+1); QDomElement e = n.toElement(); QTableWidgetItem *item = new QTableWidgetItem; item->setText(e.attribute("编号")); ui->tableWidget->setItem(row,0,item); QDomNodeList list = e.childNodes(); for(int i=0; i
               
                setText(node.toElement().text()); ui->tableWidget->setItem(row,1,item); } else if(node.toElement().tagName() == "作者") { item->setText(node.toElement().text()); ui->tableWidget->setItem(row,2,item); } } } } n = n.nextSibling(); } //显示加载完毕,2秒钟后自动消失 statusBar()->showMessage("加载完毕",2000);}

这里写图片描述

把bin文件展示成图片显示出来

想看一个bin文件里的图片，就写了这个工具，宽度和高度设置图片的大小，时间设置自动播放的间隔，位置显示读取到文件的哪个位置，宽度高度和时间可以不用设置，有默认值，主要思路是把3个字节转化成3个0-255int值，这3个值为RGB值，构造颜色，然后把像素画出来

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();    //默认显示的宽度    int width = 640;    //默认显示的高度    int height = 480;    //记录已经显示的游标的位置    int cursor = 0;    //记录文件名字    QString fileName;    //记录bin文件的16进制编码    QString fileData;    //自动播放的定时器    QTimer *timer;private:    Ui::MainWindow *ui;public slots:    //设置参数    void set();    //显示图片    void showImage();    //显示下一张图片    void next();    //设置自动播放    void autoPlay();};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){ ui->setupUi(this); timer = new QTimer(this); connect(ui->fileBtn,SIGNAL(clicked()),this,SLOT(showImage())); connect(ui->okBtn,SIGNAL(clicked()),this,SLOT(set())); connect(ui->nextBtn,SIGNAL(clicked()),this,SLOT(next())); connect(ui->checkBox,SIGNAL(stateChanged(int)),this,SLOT(autoPlay())); connect(timer,SIGNAL(timeout()),this,SLOT(next())); statusBar()->showMessage(tr("未设置参数")); ui->lineEdit_4->setReadOnly(true);}MainWindow::~MainWindow(){ delete ui;}void MainWindow::showImage(){ cursor = 0; ui->lineEdit_4->setText(tr("00000000")); QString line; //file1文件保存的是上一次打开文件的地址 QFile file1("/savefile.txt"); if(file1.open(QIODevice::ReadOnly)) { QTextStream in(&file1); line = in.readLine(); } file1.close(); QString fileName = QFileDialog::getOpenFileName(this,"请选择上传的文件",line,tr("Text files(*.bin)")); //上面的这一部分操作保证的是打开的是上一次的上传的文件 //用户没选中文件，接着进行下面的操作就会崩溃,因为s是一个空字符串 if(fileName.isEmpty()) return; //将这次打开的文件的地址重新写入到保存文件地址的文件中,如果用户没有重新选择就不用保存 if(file1.open((QIODevice::WriteOnly))) { QTextStream in(&file1); in<
            
             label_3->setPixmap(mainmap); ui->label_3->setVisible(true); file.close();}void MainWindow::set(){ QString str1 = ui->lineEdit->text(); width = str1.toInt(); QString str2 = ui->lineEdit_2->text(); height = str2.toInt(); statusBar()->showMessage(tr("设置参数成功"));}void MainWindow::next(){ QString address = QString::number(cursor/2,16).toUpper(); QString str; int len = address.length(); for(int i=0; i<8-len; i++) str += "0"; address = str + address; ui->lineEdit_4->setText(address); QImage mainimg(width,height,QImage::Format_ARGB32); QPainter painter(&mainimg); int y = 0; for(int i=0; i
             
               fileData.length()) { statusBar()->showMessage(tr("读到文件尾部")); return; } QString data = fileData.mid(cursor,6); cursor += 6; int a[3]; for(int k=0; k
              
               label_3->setPixmap(mainmap); ui->label_3->setVisible(true);}void MainWindow::autoPlay(){ if(ui->checkBox->isChecked()) { int src; QString str = ui->lineEdit_3->text(); if(str == "") src = 1000; else src = str.toInt(); timer->setInterval(src); timer->start(); } else timer->stop();}

这里写图片描述

QXmlStreamReader和QXmlStreamWriter

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QFile file("my.xml");    if(!file.open(QFile::WriteOnly | QFile::Text))        return 1;    QXmlStreamWriter stream(&file);    stream.setAutoFormatting(true);    stream.writeStartDocument();    stream.writeStartElement("library");    stream.writeStartElement("book");    stream.writeAttribute("id","01");    stream.writeTextElement("title","Qt");    stream.writeTextElement("author","you");    stream.writeEndElement();    stream.writeStartElement("book");    stream.writeAttribute("id","02");    stream.writeTextElement("title","Linux");    stream.writeTextElement("author","my");    stream.writeEndElement();    stream.writeEndDocument();    file.close();    qDebug() << "wirte finished";    file.setFileName("my.xml");    if(!file.open(QFile::ReadOnly | QFile::Text))        return 1;    QXmlStreamReader reader(&file);    // 如果没有读到文档结尾，而且没有出现错误    while (!reader.atEnd()) {        // 读取下一个记号，它返回记号的类型        QXmlStreamReader::TokenType type = reader.readNext();        // 下面便根据记号的类型来进行不同的输出        if (type == QXmlStreamReader::StartDocument)            qDebug() << reader.documentEncoding() << reader.documentVersion();        if (type == QXmlStreamReader::StartElement) {            qDebug() << "<" << reader.name() << ">";            if (reader.attributes().hasAttribute("id"))                qDebug() << reader.attributes().value("id");        }        if (type == QXmlStreamReader::EndElement)            qDebug() << "
        ";        if (type == QXmlStreamReader::Characters && !reader.isWhitespace())            qDebug() << reader.text();    }    // 如果读取过程中出现错误，那么输出错误信息    if (reader.hasError()) {        qDebug() << "error: " << reader.errorString();    }    file.close();    return a.exec();}

my.xml

这里写图片描述

UDP发送和接收数据

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();    QToolBar *tool;    QAction *sendAction;    QTimer *timer;    QUdpSocket *sendSocket;    QUdpSocket *receiveSocket;    int port;private:    Ui::MainWindow *ui;public slots:    void setSend(bool flag);    void sendMsg();    void receiveData();};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    tool = addToolBar("tool");    sendAction = new QAction("开始",this);    sendAction->setCheckable(true);    tool->addAction(sendAction);    timer = new QTimer();    sendSocket = new QUdpSocket(this);    receiveSocket = new QUdpSocket(this);    port = 5555;    if (!receiveSocket->bind(port)) {        QMessageBox::information(this,"error","udp socket create error");        return;    }    connect(sendAction,SIGNAL(toggled(bool)),this,SLOT(setSend(bool)));    connect(timer,SIGNAL(timeout()),this,SLOT(sendMsg()));    connect(receiveSocket,SIGNAL(readyRead()),this,SLOT(receiveData()));}MainWindow::~MainWindow(){    delete ui;}//选中QAction就发送，不选中就不发送void MainWindow::setSend(bool flag){    if (flag) {        timer->start(1000);    } else {        timer->stop();    }}//发送数据到指定端口void MainWindow::sendMsg(){    QString msg = ui->sendTextEdit->toPlainText();    if (msg == "")        return;    //QSting的内容转成QByteArray,长度没有发生变化    int len;    /*     * writeDatagram的三个参数的含义是要发送的数据，发动的地址，从哪个端口号发送     * len发送成功返回发送的长度，发送失败返回-1     */    if ((len = sendSocket->writeDatagram(msg.toLatin1(),QHostAddress::Broadcast,port)) != msg.length()) {        return;    }}//从指定端口接收数据void MainWindow::receiveData(){    while (receiveSocket->hasPendingDatagrams()) {        QByteArray array;        array.resize(receiveSocket->pendingDatagramSize());        /*         * array.data()返回的是char*类型         * 读取array.size()长度的数据放到array.data()中         */        receiveSocket->readDatagram(array.data(),array.size());        QString msg = array.data();        ui->receiveTextEdit->insertPlainText(msg+"\n");    }}

这里写图片描述

QStackedWidget类和QListWidget混合使用

QToolBox使用

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测试按钮

具有复选框的树形控件

设置一个特定输入的文本框

分隔窗口（各个窗口的大小可以随意拖拽）

进度条和进度条对话框

电子时钟

QStackedLayout

QDockWidget使用

带标签的QDockWidget

可扩展对话框练习

读取文件

QTextStream类读写文件

读写二进制文件

递归读取分目录和总目录的大小

文件显示器

获取文件信息

主窗体练习

QTableWidget

QTabWidget

QTreeWidget

QListWidget

QListWidget实现文件组的选择

从XML中解析出来的数据显示在QTableWidget中

把bin文件展示成图片显示出来

QXmlStreamReader和QXmlStreamWriter

UDP发送和接收数据

QStackedWidget类和QListWidget混合使用

QToolBox使用

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